"Project cannot be built until its prerequisite is built" errors each time I close & open VSCode

I have a multi-module Maven project that I created using Eclipse, and now I am trying to migrate to VSCode.

I have opened the project in VSCode, and it has updated all .project and .classpath files. There is no error in the project, and everything seems to work perfectly.
But after I close VSCode and open it again, without having changed a single line, after Java builds everything, suddenly most of the modules are in red, and I see this type of error in the Problems tab:

"The project cannot be built until its prerequisite XXX is built. Cleaning and building all projects is recommended"

If I "Clean Java Language Server Workspace", the problems disappear, until I close+open VSCode again.
If I "Force Java Compilation > Full", the same. Problems disappear until the next restart.

I guess this shouldn't happen, but I don't know if it is a problem in my project (as I've said, everything works until I close the workspace), I have something configured incorrectly or it is a bug in vscode-java (and if so, if there's any workaround).

I am using JDK 8.

I have tried the pre-release version too, but I get the same problems.

Thank you in advance, please let me know if you need more info.

Beginnen Sie damit, den Fehler mit dem Multi-Modul-Maven-Projekt nach dem erneuten Öffnen von VSCode zu reproduzieren, und vergleichen Sie die Dateien .project und .classpath vor und nach Java-Builds. Prüfen Sie, ob das Bereinigen des Java Language Server Workspace oder die Verwendung von Force Java Compilation > Full das Ergebnis verändert. Als erledigt gilt die Aufgabe, wenn die Ursache im Zusammenhang mit dem Neustart oder eine zuverlässige Umgehungslösung für die voraussetzungsbedingten Fehler identifiziert wurde.